Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68ee40753a02d18…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b4df0b2d92fbed6bbe0cbf432a937ca SHA-1: 74420f4b827ddf580d3674e47762f5b396a81188 SHA-256: e68ee40753a02d18cb2e7bebe052ab783d1a12b8d9cba6c8687336fe9d3f22e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the use of SEO tactics on disposable hosting to obscure the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=synder+cut+online PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a551ca57c16461bbeb83563470d22ca2/59972324668.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/wapamupikovokakoso.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wexudiluju.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/96581177590.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/94730125134.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/24333302905.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/20890584286.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/25548253267.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3750b22d---92518529245.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/34265024840.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/23389759257.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/vepemajetiwuleremagepax.pdfIn PDF document text
    • https://ksuskalology.com/images/file/ritilixowupebituzubufol.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/nijini.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/66052062961.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vexexevagolimulubijojepek.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143b19b60814---50646453163.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161451b246d4d2---larugogaz.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/35312498437.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/24520397050.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/68491110280.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/juxotemexoxelisozawaxa.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/xivibitijemosos.pdfIn PDF document text
    • http://hingliltd.com/userfiles/tisedu.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/13639612081.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/68002134057.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 19500 bytes
SHA-256: 835685117e156f32ed1850f0c9437b858a9ae5a91a2d0a597681cfe4c2a56d0d
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 10324 bytes
SHA-256: 06959ebe2bde556e017e583a3a83de6e448759e3ca41b547d896e655a3cde836

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